Dumping scraper



June 4, 1940. A. G. GuRRlEs DUMPING SGRAPER Filed March 51, 1959 2 Sheets-Sheet 2 KNVENTOR 21.6. Gui" ""esv ATTORN EY Patented June '4, 1940 DUMPING SCRAPER Albert Gurries, Gilroy, cane, assignor to Be-Ge Manufacturing Company, Gilroy, Calif., a co artnership comprising Albert G. Gurries and ames A. Bussert Application March 31, 1939, Serial No. 265,207

This invention relates to carrying rear-dump l scrapers, and particularly represents "improvements over the dirt-retaining or apron structure of my copending application #254,878, filed February 6, 1939. i

In this previous structure, the apron was fixed on theframe, and inorder to properly cooperate with the bowl when, the latter moved up to a carrying positiomwas necessarily disposed where it tendedtointerfere with the desired free movement of thedirt into the bowl as the latter was in scraping position. i

Itistherefore the major object of this present invention to provide a closureapron for the bowl so arranged and mounted that when the bowl is in scraping position, thelower end of the apron is'held sufficiently advanced so as to be well clear of dirt, entering the bowl. When the bowl is lifted to carrying position, however, the apron assumes a proper cooperating position with the bowl; the movement of the-apron from one position to the other beingcontrolled by the movement of the bowl itself, so that no additional T mechanism is necessary for operating the apron.

Q5 When used for highway maintenance service,

for which this scraper is particularly designed, and when scraping dirt slides off highways, for instance, the blade of the bowl must approach close to but not cut into the hard surface of the 30 highway. Usually this requires very careful attention on the part of the operator in setting the blade at the proper level after each scraping operation, which if repeated many 'timesas'is frequently necessary, slows down the work to an 5 appreciable extent.

, It is therefore another object of my invention to provide an adjustable and easily operated means for positively limiting the downward move- T ment of the bowl relative tothe ground, irrespecm tiveof the functioning of the bowl control mechanism, so'that extreme care on the part of the operator is unnecessary.

'A further object of the invention is to produce a simple and inexpensive device and yet 45 one which will be exceedingly effective for the purposefor which it is designed. I

These objects I accomplish by meansof such structure and relative arrangement of parts as will fully appear by a perusal of the following 50 specification and claims. 1

In the drawings similar characters of reference indicate corresponding parts in the several views: I

Figure l is a side elevation of my improved 55 scraper, partly in section and showing the bowl "forward end of the cylinder in axial alinement with the piston rod and engages the piston after loweredto a scraping position adjacent ground or roadlevel.

Figure 2 is a sectional elevation showing the bowl raised to carrying position.

Figure 3 is a top plan view of the apron de- 5 tached. Figure 4 is a fragmentary sectional plan ofa bowl-control hydraulic cylinder unit, showing the 1 adjustable piston stop.

Referring now more particularly to the char- 1o 3 acters of reference on the drawings, the frame same configurationas in said copending applicatlon, is disposed between the side beams rearwardly of the cross beam. and is supported at its back from the side beams i rearwardly of the wheels, by a cross shaft 6. The bowl includes side plates 1 and a scraping blade 8 terminating substantially flush with the plates at their forward edge.

The rotationof the bowl, to move it between scraping, carrying and dumping positions and vice-versa, is controlled as before by hydraulic units, one on each side. Each unit includes a cylinder 9 a piston l0 therein and a piston rod II projecting rearwardly from the cylinder and pivotedon the adjacent side plate of the bowl near its rear end andabove pivot shaft 6. The cylinder at its forward end is provided with laterally projecting trunnions l2 turnable in mounting ears l3 upstanding from adjacent side beam I near cross beam 3.

An adjustment screw I4 is threaded into the predetermined forward movement thereof as shown in Fig. 4. Since such forward movement obviously controls lowering movement of the front end and blade of the bowl, it will be seen that positive stopping of such forward movement by the screw I4 likewise positively limitsdownward movement of the blade irrespective of the hydraulic pressure supplied to the cylinder rearwardly of the piston, and the blade may thus be held at any desired level relative to the ground without any attention on the part of the operator being necessary. a H The front apron for the bowl is in the form of ,the housings.

a plate 15 extending substantially'thje full width of the bowl between the side plates. Intermediate its ends, the platoon its :frontside is :rein- :forced by vertical ribs I6. These ribsratl thettop -walls,ithe springsthus acting "to swingthe apron rearwardly. such rearward movement :is Klimited byadjustable'nuts 2| onthe rods ahead of The apron plate at its ends "is'provided with other vertical ribs 22 serving as supports .for

rollers 23 disposed laterally out from .saidribs vand-acertain distancebelow pivot-pins I127, "The front edges-of the side plates 1 0f the bowl are provided with outwardly projecting flanges 24 whichform cam tracks onthe roller ride.

The'upper portion of the cam tracks, which-en- ,gage the rollers when thebiadeB isjin scraping position, are concentric with'the bowl1pivot ,6,-so that with turning of the bowlstovarious scraping levels, there will be nomovement of the apron.

When the rollers are thus engaged,.the apronis held at a forwardslope .to its lower end,as=:shown in Fig. 1, so that such end is ahead ofanydirt boiling up in front of'the blade with :the advancing .movementofthe bowl and blade. The

"pivotrpoi'nt of the apron is at such ahe'ight relative .to the depth of the latter that its 'lowerend is then adjacent the lower edge of the cross beam 3.

The lower portion of the cam tracks is dis- :posediin such relation totthe bowl pivot that as the latter swings up to carrying -position, the rollers, while stillengaging theitracks, will move rearwardlyas urged by springs 2|, until-when "the bowlx'finally assumesa carrylng'positiongthe the rollers remain in position to besreengaged by apron projects between .the side plates tandem- "gages the .biade as shown in .Fig. 2, thus :forming anefiicient closure and dirt retainer forfthe'front end of the bowl. It will be noted, however, that nothing but the yieldable springs forces'the apron to such blade engaging position, so that in the event that an obstructionlat the blade should prevent actual engagement of the apron therewith, :no harmful strains will be-placed on the apron or its operating parts.

When the bowl is swung. to a dumping'position and the cam tracks leave the rollers the nuts 2! limit rearwardmovement of the-apron sort-hat g the cam tracks as the bowl is again swung down to an operating position.

Fromthe foregoingdescription it will be readily seen that I have produced sucha device as substantially fulfills the objects of the invention asset forthherein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may beresorted to as do ,not form'asdeparture from the spirit of the invention, as defined by the appended claims. I

Having'thusdescribed my invention, what I claim as new and useful-anddesire to secure by Letters Patentis:

1. A scraper'including a supporting frame, a

bowl mounted in'the frame for 'vertical'movement at its forward end to dispose said end in scraping and relatively raised carrying positionsal- "and carrying positionsalternately,

ternately, an apron mounted oil the frame :in front ,of the bowl to form a closure with the ,bOWlflb'iiJS front -;end when the latter'isin carrying position and ,meansbetween the bowl and zapronhto shift thealowerendofthe latterforwardly bylowering-movement of the front end of :the bowl; said last named means comprising a cam track :on the bowl ,at the front thereof and an element on the apron -'engaging;said track.

:2. Ascraper including .a supporting frame, a

bowl .mounted on the frame for vertical :move- *ment at its forward ,end to dispose said end in scraping and carrying positions alternately, .an .apron disposed in front; ofv the bowl,-means pivot- }ing :the apron at :the .top on the frame .in posi- .tion .to forma closure qforitheifront end of the bowl "when the .latteriis in carrying position and :means between the i-bowl and apron to swing the latter -.forwardly =.-with lowering of the :front end of the bowl to .a scraping position; ,said last namedmeans comprisingaroller mounted on the side of the apron belowthe pivot thereof and a -,cam track :on :the front 'edge'of the bowl normallyengaging the roller.

3; vAstructure asin claim 12, in-which said cam track, :for an :extentcorresponding tormovement ,of the frontend of g thevbowl between lthe :limits of v its scraping levels, beingrconcentric with the 'pivotof-the bowl.

4. A scraper including ,a supporting frame; a

bowl mounted in the frame :for movement in a vertical plane to "dispose fits ;forward end' in scraping and carrying positions :alternatelyg an apron disposed in front of i the bowl, means pivotingthe apron at thetop on the framein position to'form a closureforthe front rend of the bowl; when the latter is in carrying position, said means including transversely spaced housings mounted'on :the frame, rods connected to the apron below the pivot means and projecting forwardly through the front wall of the housings l with a sliding fit, compression springsnab'out the rods-between the apron and the 'front' wall of the housings and actingitoyieldably swing the apron rearwardly, stops, on the rods ahead-of a the hous- 'ings 'to limit rearward movement of the apron and means between the bowl and apron to swing the latter forwardly against the resistance of the springs with lowering movement of the front end of the bowl to ascrapingposition.

5 A scraper including a supporting frame,ia

bowl mounted in the frame for vertical movement at its forward end'to dispose said end in scraping and-relatively raised carrying positions alternately, an apron mounted on the frame in front of the bowl-to form a closure withithe 'bowl at itsfront'end when'the latter is in carrying position and means between thebowi and apron to shift the lower end of the latterforwardly a predetermined distance by lowering movement of the front end of the bowl from-a carrying position tothe topmost scraping position, and to hold; the apron stationary with further lowering movement ofthebowl.

6. A scraper including .a supporting frame. av

' wl mounted on theframe for vertical movement at its forward end-to "dispose said end in scraping an apron disposed infront of the bowl and mounted; on the frame in position to form a closure with the bow] at its front end when the latter is in'carrying position and movable forwardly from its 010'- -sure forming position, and independent separable elements ontthe bowliandapronv engageable with each other' -between carrying and: scraping positions of the bowl to shift the lower end of the apron forwardly by lowering movement of the bowl from a carrying position. v

7, A scraper including a supporting frame, a bowl mounted in the frame for vertical movement at its front end to enable said end to be moved from a scraping to a carrying position and thence farther upwardly for dumping, an apron disposed in front of the bowl, means pivoting the apron at the top on the frame in position to form a closure for the front end of the bowl when the latter is in carrying position, a roller mounted on to re-engage the cam track upon the lowering of 10 the bowl from a dumping position.

ALBERT G. GURRIES. 

